Claims
- 1. A high turn-down burner for simultaneously introducing a plurality of streams of free-oxygen containing gas in admixture with a pumpable slurry of solid carbonaceous fuel downward into the reaction zone of a free-flow partial oxidation gas generator comprising: a central cylindrically shaped conduit having a central longitudinal axis that is coaxial with the central longitudinal axis of the burner; an unobstructed converging exit nozzle that develops into a straight cylindrical portion with a circular exit orifice at the downstream end of the central conduit; closing means attached to the upstream end of said central conduit for closing off same; inlet means in communication with the upstream end of the central conduit for introducing a gaseous feedstream selected from the group consisting of free-oxygen containing gas, steam, recycle product gas, and hydrocarbon gas; a second conduit coaxial and concentric with said central conduit along its length, a coverging exit nozzle that develops into a straight cylindrical portion with a circular exit orifice at the downstream end of the second conduit; means for radially spacing said central and second conduits and forming therebetween a first annular passage which develops into a right annular passage near the downstream end; closing means attached to said second conduit and first annular passage at their upstream ends for closing off same, said central conduit passing through the upstream closed end of said second conduit and making a gastight seal therewith, and inlet means in communication with the upstream end of the second conduit for introducing a pumpable slurry feedstream of solid carbonaceous fuel; a third conduit coaxial and concentric with said second conduit along its length, means for radially spacing said second and third conduits and forming therebetween a second annular passage that develops into a converging frustoconical portion towards the downstream end with a converging angle with the longitudinal axis of the burner in the range of about 15.degree. to 60.degree.; closing means attached to the second annular passage and third conduit at their upstream ends for closing off same, said second conduit passing through the upstream closed end of the third conduit and making a gastight seal therewith, and inlet means in communication with the upstream end of the third conduit for introducing a feedstream of free-oxygen containing gas into said second annular passage; an outer conduit coaxial and concentric with said third conduit along its length, an outer converging nozzle near the downstream end of the outer conduit which discharges through a circular exit orifice at the tip of the burner, means for radially spacing said third and outer conduits and forming therebetween an outer annular passage that develops into a converging frustoconical portion towards the downstream end with portions having a converging angle with the longitudinal axis of the burner in the range of about 15.degree. to 60.degree.; closing means attached to the third annular passage and outer conduit at their upstream ends for closing off same, said third conduit passing through the upstream closed end of the outer conduit and making a gastight seal therewith, and inlet means in communication with the upstream end of the outer conduit for introducing a feedstream of free-oxygen containing gas into said third annular passage; a separate feedstream conduit externally connected to each of said inlet means; and flow rate control means in each of said feedstream conduits for separately controlling the flow rate of the feedstream passing through said feedstream conduits; flanging means attached to the outside surface of said outer conduit for aligning the longitudinal central axis of said burner along the central axis of the gas generator while the downstream end of said burner is passed downwardly through a port in the top of the gas generator; an outer rearwardly extending annular water-cooled chamber of elliptical cross-section encircling the downstream end of the burner; wherein the tips of said central, second and third conduits may be retracted upstream from the outer conduit exit orifice, or may terminate with the outer conduit exit orifice in the same plane perpendicular to the longitudinal axis of the burner; and wherein a cylindrical shaped slurry stream with a gaseous core passes through the front portion of the burner and is impacted by two high velocity streams of free-oxygen containing gas or at high turn-down of the burner one high velocity stream of free-oxygen containing gas said impact taking place prior to, at, or downstream from the tip of the burner to provide atomization and intimate mixing of the slurry feed with free-oxygen containing gas.
- 2. The burner of claim 1 wherein the downstream tip of the central conduit is retracted upstream from the outer conduit exit orifice a distance in the range of about 0 to 2.0 times the diameter of the outer conduit exit orifice at the tip of the burner.
- 3. The burner of claim 1 wherein the downstream tips of the second and third conduits are retracted upstream from the outer conduit exit orifice a distance of about 0 to 1.0 times the diameter of the outer conduit exit orifice at the tip of the burner.
- 4. The burner of claim 1 wherein the tips of the second and third conduits are progressively retracted upstream from the outer conduit exit orifice, and the retraction of the tip of the central conduit is the same as that for the tip of the second conduit, or more so as to provide a diverging frustoconical discharge zone prior to the downstream tip of the burner.
- 5. The burner of claim 1 provided with water cooled cooling coils encircling the outside circumference of the burner at the downstream end.
- 6. The burner of claim 1 wherein the second and outer passages are parallel with respect to each other, or portions converge at an angle in the range of about 0.degree. to 90.degree..
Parent Case Info
This is a division of application Ser. No. 499,620, filed May 31, 1983 now U.S. Pat. No. 4,443,230.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
4113445 |
Gettert et al. |
Sep 1978 |
|
4386941 |
Crouch et al. |
Jun 1983 |
|
4443228 |
Schlinger |
Apr 1984 |
|
Foreign Referenced Citations (1)
Number |
Date |
Country |
543003 |
Feb 1932 |
DE2 |
Divisions (1)
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Number |
Date |
Country |
Parent |
499620 |
May 1983 |
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